Surface Volume Resistivity Tester

Summary

The Integrated Precision Oil Dielectric Loss and Volume Resistivity Tester is a high-precision instrument designed for the testing of dielectric loss angle and volume resistivity of insulating oils and other liquid insulating media. It features an integrated structure housing key components such as the dielectric loss oil cup, temperature controller, temperature sensor, dielectric loss test bridge, AC test power supply, standard capacitor, high-impedance meter, and DC high-voltage source. The heating section employs the advanced high-frequency induction heating method, which offers advantages such as non-contact between the oil cup and the heating element, even heating, fast speed, and easy control. The AC test power supply utilizes...AC-DC-ACThe conversion method effectively avoids the impact of fluctuations in grid voltage and frequency on the accuracy of dielectric loss tests, even when the generator is generating electricity. The internal standard capacitor isSF6Inflatable Tri-No Chinese content provided. Please provide the news content to be translated..The model capacitor features a dielectric loss and capacitance that remain unaffected by environmental factors such as temperature and humidity, ensuring consistent accuracy even after long-term use of the instrument.

The instrument is internally equipped with full digital technology, featuring fully automated measurements with multiple modes, and is equipped with a large screen.320×240Touchscreen display, full Chinese menu, with Chinese prompts for every step, test results can be printed out, and operators can master the operation without professional training.

Operating Principle

U-Heating

The instrument utilizes a high-frequency induction furnace for heating. Once the heating is initiated, the temperature control...CPUIssue heating command while collecting the temperature values from the internal oil cup temperature sensor, utilizing variable power control for heating.PWMA combination of control methods is implemented. When the oil sample temperature is low, a high-power heating method is used, which is beneficial for shortening the oil sample heating time; once the temperature approaches the preset temperature, a lower power is employed.PWMHeating method, which ensures even heating of the oil samples.

High-frequency induction furnace heating eliminates the issue of uneven heating of the heating block.

uControl Temperature

As the measured temperature approaches the set temperature, temperature controlCPUAdopting low-powerPWMMethod of heating, sampled temperature valuesPIDOperations and analysis yield excellence.PWMMaintain a precise duty cycle to ensure strict control of the temperature within the preset error range.

Ultrasound Measurement

Test voltage is simultaneously applied to the internal standard capacitor of the instrument and the oil cup.Extreme.Above, the circuit measurements were conducted for these two signals.PGAPost-control, synchronize the signals of the two channels.ADSampling, transmitting digital signalsDSP(Digital Signal Processor)DSPFilter it accordingly.FFTPlease calculate after the operationtgδ、C x  Parameters such as ε, etc., are sent to the main controller.CPU。

Volume Resistivity Measurement

DC high-voltage test voltage applied to the oil cup pressureExtreme.Upon testing the circuit loop, a faint current signal was generated, which was then amplified by the measuring circuit and sent to...ADSampling, transmitting digital signalsDSP(Digital Signal Processor)DSPProcess the signal, calculateRxParameters such as ρ, etc., are sent to the main controller.CPU。